test/system: Test 'completion'

https://github.com/containers/toolbox/pull/1165

test/system/108-completion.bats

@@ -0,0 +1,77 @@
+#!/usr/bin/env bats
+
+load 'libs/bats-support/load'
+load 'libs/bats-assert/load'
+load 'libs/helpers'
+
+setup() {
+  _setup_environment
+}
+
+@test "completion: Smoke test with 'bash'" {
+  run $TOOLBOX completion bash
+
+  assert_success
+  assert [ ${#lines[@]} -gt 0 ]
+  assert [ ${#stderr_lines[@]} -eq 0 ]
+}
+
+@test "completion: Smoke test with 'fish'" {
+  run $TOOLBOX completion fish
+
+  assert_success
+  assert [ ${#lines[@]} -gt 0 ]
+  assert [ ${#stderr_lines[@]} -eq 0 ]
+}
+
+@test "completion: Smoke test with 'zsh'" {
+  run $TOOLBOX completion zsh
+
+  assert_success
+  assert [ ${#lines[@]} -gt 0 ]
+  assert [ ${#stderr_lines[@]} -eq 0 ]
+}
+
+@test "completion: Try without any arguments" {
+  run --separate-stderr $TOOLBOX completion
+
+  assert_failure
+  assert [ ${#lines[@]} -eq 0 ]
+  lines=("${stderr_lines[@]}")
+  assert_line --index 0 "Error: accepts 1 arg(s), received 0"
+  assert_line --index 1 "Run 'toolbox --help' for usage."
+  assert [ ${#stderr_lines[@]} -eq 2 ]
+}
+
+@test "completion: Try with invalid arguments" {
+  run --separate-stderr $TOOLBOX completion foo
+
+  assert_failure
+  assert [ ${#lines[@]} -eq 0 ]
+  lines=("${stderr_lines[@]}")
+  assert_line --index 0 "Error: invalid argument \"foo\" for \"toolbox completion\""
+  assert_line --index 1 "Run 'toolbox --help' for usage."
+  assert [ ${#stderr_lines[@]} -eq 2 ]
+}
+
+@test "completion: Try with unknown flag" {
+  run --separate-stderr $TOOLBOX completion --foo
+
+  assert_failure
+  assert [ ${#lines[@]} -eq 0 ]
+  lines=("${stderr_lines[@]}")
+  assert_line --index 0 "Error: unknown flag: --foo"
+  assert_line --index 1 "Run 'toolbox --help' for usage."
+  assert [ ${#stderr_lines[@]} -eq 2 ]
+}
+
+@test "completion: Try with unsupported shell" {
+  run --separate-stderr $TOOLBOX completion powershell
+
+  assert_failure
+  assert [ ${#lines[@]} -eq 0 ]
+  lines=("${stderr_lines[@]}")
+  assert_line --index 0 "Error: invalid argument \"powershell\" for \"toolbox completion\""
+  assert_line --index 1 "Run 'toolbox --help' for usage."
+  assert [ ${#stderr_lines[@]} -eq 2 ]
+}